Refactor entities and codebase for native property usage

- Replaced getters/setters with direct property access across entities and repositories.
- Added and configured `martin-georgiev/postgresql-for-doctrine` for PostgreSQL enhancements.
- Updated Doctrine configuration with types, mappings, and JSONB query functions.
- Removed unused `EliminationService` and related YAML configurations.

migrations/Version20250427174822.php

@@ -7,9 +7,6 @@ namespace DoctrineMigrations;
 use Doctrine\DBAL\Schema\Schema;
 use Doctrine\Migrations\AbstractMigration;
 
-/**
- * Auto-generated Migration: Please modify to your needs!
- */
 final class Version20250427174822 extends AbstractMigration
 {
     public function getDescription(): string
@@ -19,7 +16,6 @@ final class Version20250427174822 extends AbstractMigration
 
     public function up(Schema $schema): void
     {
-        // this up() migration is auto-generated, please modify it to your needs
         $this->addSql(<<<'SQL'
             ALTER TABLE answer ADD ordering SMALLINT DEFAULT 0 NOT NULL
             SQL);
@@ -30,7 +26,6 @@ final class Version20250427174822 extends AbstractMigration
 
     public function down(Schema $schema): void
     {
-        // this down() migration is auto-generated, please modify it to your needs
         $this->addSql(<<<'SQL'
             ALTER TABLE answer DROP ordering
             SQL);